Rotating-cylinder internal-combustion engine.



P.G.TACCHI. ROTATING CYLINDER INTERNAL COMBUSTION ENGINE.

APPLICATION FILED IAN. 2, I9I8.

1,286, 142. Patented Nov. 26, 1918.

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PERCY GEORGE TAGCHI, OF NEW WANSTEAD, ENGLAND, ASSIGNOR TO CENTRUM SYNDICATE LIMITED, OF LEEDS PLACE, LONDON, ENGLAND.

ROTATING-CYLINDER INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented Nov. '26, 1918.

Application filed January 2, 1918. Serial No. 209,855.

To all whom it may concern:

Be it known that I, PERCY GEORGE TACOHI, a subject of the King of Great Britain, residing at Baytree House, New 'Wanstead. in the county of Essex, England, have invented certain new and useful Improvements in R0- tating Cylinder Internal Combustion Engines, of which the following is a specification.

. This invention relates to two-stroke internal combustion engines of the type in which rotating cylinders are employed, having outwardly driven pistons controlled by means of a fixed cam track, the chief object of the invention being to simplify the construction-of this type of engine and to avoid the use of valves.

According to this invention the pistons during their inward stroke are-arranged to draw the charge of combustible mixture or air into the engine casing and to compress it in the casing during the greater part of their inward stroke, the compressed charge being admitted to the combustion chamber through a transfer port or channel opened by a piston shortly after the exhaust ha been opened by another piston.

In order that the said invention may be clearly understood and readily carried into effect we will describe the same more fully with reference to the accompanying drawings, in which Figure 1 is a section through the axis of a single cylinder engine with a pair of opposed cylinders, the two pistons being shown in different positions for purposes of illustration.

Fig. 2 is an elevation of the cylinder cast- Fig. 3 is a part sectional view of the said casting taken at right angles to Fig. 1.

Fig. 4 is an elevation of the engine casing.

Fig. 5 shows the cam track; and

Fig. 6 is a diagram of the engine cycle.

A is the fixed engine casing, made in two disk-shaped halves bolted together with the cam track B between them. C isjhe cylining A which follows the outline of the main cam track B and keeps the pistons out when the engine is stationary and the pistons are unsupported by internal pressure in the common combustion chamber D.

a Each cylinder element is provided With a piston controlled port 03 which registers alternately with an exhaust aperture a in the engine casing and with a fuel transfer channel a in the engine casing, so that at the end of the outward stroke of the pistons, when the cylinder ports (5 are both uncovered, the charge, slightly compressed. in the casing as hereinafter described, enters the combustion chamber D at one end, driving out the products of combustion through the exhaust eat the other end, and fills the chamber with a fresh charge which is compressed between the pistons on their return stroke, as soon as they close the cylinder ports (Z.

The external cam trackBis so formed that the piston E controlling the exhaust begins to uncover its cylinder port d, which port already communicates with the exhaust channel a in the casing A, before the other piston begins to open the transfer port. The exhaust therefore is always opened slightly before the fuel is admitted to the cylinder so that the pressure in the cylinder falls below the pressure in the casing before the new charge is admitted, the products of combustion being driven out in front of the entering charge.

The cam track B is made slightly unsymmetrical to give the desired lead to the exhaust and a portion of the track I) at one end where it is most distant from the center may be made concentric so that the pistons remain stationary in their cylinders during the greater part of the exhaust, to allow the transfer and exhaust ports to remain fully open and insure a full supply of new mixture and an eliicient exhaust. The exhaust opening portion 6' of the track is formed in a curve of larger radius than the compression portion 6 to give the slight lead to the exhaust. The transfer channel a in the casing A is preferably arranged to make communication between the piston controlled port (2 in each of the cylinder elements and a second or outer cylinder port or channel (1', a short distance beyond the first port (Z and open to the casing behind the pis ton. The channel 0! extends around the outside of the cylinder D to meet the deep channel 0 in the casing G, into which the cam track B extends. The transfer channel a can be made very short, and consists merely of a bulge 0n the casing, asshown in Figs. 1 and 4.

The charge is drawn into the casing A through suitable suction ports a open to a carbureter if the combustible mixture is to be drawn in. The said ports a register with the outer cylinder ports'or channels d during the suction part of the cycle, but are closed by the cylinder casting C at the end of the inward piston stroke to prevent escape of the charge during the compression in the casing. The outer cylinder ports (1 therefore perform a double function. The charge may be compressed in the casing to say about'9 lbs. per squareinch.

The pistons and ports alternately perform the exhaust and transfer functions so that two complete cycles are obtained for each revolution of the engine. The alternating operation also serves to equalize the temperature. If scavenging air is compressed in the casing the fuel may be injected into'the transfer channel a during'the latter portion of the scavenging operation in order a to form the explosive mixture. A fuel connection a is indicated in chain lines in Fig. 4E.

The faces of the cylinder casting are-covered in by the disks "0, c which make a gas tight joint with the casing, a'ring 0 being provided at the shaft side of the casting to form the joint.

The diagram, Fig. 6, shows the various stages of a complete cycle of the engine'illustrated, the cycle being repeated at every half revolution. Starting with the pistons atthe beginning of the compression stroke (in the position of the upper piston of Fig. 1), the compression in the cylinder and simultaneous suction of the new charge into the casing during the inward piston strokeare indicated by the lines 00, 3 extending for equal angles *to the end of the inward piston stroke, when both pistons are in the posi tion of the lower piston in Fig.1. The expansion or working stroke of the, pistons is indicated by the line a? and the simultaneous compression in the casingby the line The exhaust and scavenging periodindicated by the shaded part 2 representing the port opening overlaps, as shown, the case compression and cylinder expansionperiod owing to the lead given tothe'exhaust by the cam track acting'through the. piston at the exhaust side while the'fuel' transfena'n'd scavenging period indicated by the shaded part 2' begins at the end of theexpansion stroke (when both ports (Z are uncovered by their pistons) and occupies a smaller angle.

:All the operations are efi'ected without the Copies of this patent may be obtained for mamas use of valves, so that the engine is entirely ..ters Patent oftheUnited States is 1. In a rotating cylinder internal combustion engine of the kind set forth, means for introducing a charge into the fixed engine casing by the inward stroke of the pistons and for compressing it in the casing by the outward stroke, a piston controlled exhaust and a piston controlled transfer port in the cylinder admitting the compressed charge to the combustion chamber.

2. Ina rotating cylinder internal combusti on engine of the kind set'forth, a fixed engine casing, an admission port in said casing, a rotating cylinder casting adapted to cover and uncover said admission port for the'admission of'the charge to the casing by the inward stroke of the pistons and for compression' therein by the outward stroke, a piston controlled exhaust and a piston controlled itransfer, port in the cylinder admitting the compressed charge to the combustion chamber.

3. In an engine as claimed in claims '1 and 2, said a'dmission'port in the fixed casing adapted lto'be opened to the interiorgof the casing by the aforesaid transfer port in the cylinder, for the purposespecified.

4. Inan'engine as claim'ed'in claim 1, said pistonports each adapted to be uncovered by its' piston, anexhaust port in the casing adapted 'to'register in turn with the said through the said transfer channel, for the purpose specified.

' 5. 'A'rotatin'g cylinder two-stroke internal combustion engine comprising a fixed external casing, a fixed camtrack, a disk-shaped cylinder casting havinga diametrical cylinder, two opposed pistons in the said cylinder operating under the control of the track, means'for admitting a charge to the casing, two pairs of 'cylinderports, exhaust ports and a fuel transfer port in the casing, all adapted to" register with the cylinder ports, the transfer port effecting communication between the two cylinder portsiof each pair,

for thepurpose specified.

"Inan engine as claimedin claims land 2,a camtra'c'k'soformed asto'cause'one piston'to uncover the exhaust and another to openthe transfer port to the'cylinder after the exhaust hasibeen uncovered, for the purpose specified.

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fivecents each,-'byaddressing the Commissioner of Patents. "Washingtcm-Dfl. 

